Biocidal coating composition

Details Biocidal coating composition Biocidal coating composition

1999-09-17

2001-05-15

Marcantoni, Paul (Department: 1755)

Compositions: coating or plastic

Coating or plastic compositions

Contains fireproofing or biocidal agent

C106S016000, C106S792000, C106S795000, C106S805000

Reexamination Certificate

active

06231650

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to hydrated lime coatings. More particularly, the invention relates to the first safe, non-toxic hydrated lime coatings, or paints, that resist degradation by carbon dioxide for prolonged periods of time.
BACKGROUND OF THE INVENTION
Hydrated lime coatings or paints are well known as disinfectants, biocidal, and biostatic agents. In order to retain their biocidal activity after application to a desired surface, a hydrated lime coating must retain (1) the ability to pull in and substantially encapsulate a microorganism, and (2) the alkalinity necessary to kill microorganisms. In order to kill microorganisms, the lime must have a pH between about 11-13. In order to retain the alkalinity necessary to kill microorganisms, the coating, or paint, must be protected from attack by carbon dioxide.
Unfortunately, hydrated lime is highly susceptible to environmental attack, primarily by carbon dioxide. Carbon dioxide converts the hydrated lime to calcium carbonate, which does not have the alkalinity required to kill microorganisms. As a result, conventional coatings or paints containing hydrated lime are not effective as long term disinfectants, biocides, or biostatic agents.
A means is needed to prolong the biocidal activity of a hydrated lime coating.
SUMMARY OF THE INVENTION
The present invention provides a biocidal coating comprising a first amount of hydrated lime and a binder comprising a cellulose derivative selected from the group consisting of an alkyl derivative, a hydroxyl derivative, and a carboxyl derivative. The binder has film properties of a barrier for carbon dioxide but not film properties of a barrier for water vapor, said binder being present in a second amount effective to render the coating durable and adhesive upon drying and to prevent a substantial increase in friability of said coating due to the first amount of hydrated lime in the coating.


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